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Handbrake won't turn off
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kevofcov
 


Member Since: 06 Nov 2007
Location: Other end of M69
Posts: 529

England 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Java BlackDiscovery 4
Handbrake won't turn off

2016 Graphite 79,000 miles.

Tried a search but no joy.

The handbrake switches on as usual and holds the car but when pressing down for off there is nothing. No winding noise just silence and the handbrake remains on. Attempting to pull away at this point also fails to release the handbrake. Any thoughts please.

The handbrake is rarely used - only when needed but adjustment has not been done since 35,000 miles. (I know I know but I’ve never got around to it. Happy to take flak for this as I deserve it. I put my hand up)
  
Post #23028023rd Aug 2022 6:26 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4398

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Have you got auto release set?
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #23028043rd Aug 2022 6:37 pm
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Flatlander
 


Member Since: 20 Jul 2015
Location: Here
Posts: 575

United Kingdom 

Is the (P) flashing on the dash? have you tried pulling the emergency release cable?
The park brake will only release manually if you have your foot on the brake - are the brake lights working OK?
  
Post #23028053rd Aug 2022 6:37 pm
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10464

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Have a read of this thread:-

https://www.disco3.co.uk/forum/epb-repairu...ease+cable

NJSS
  
Post #23028103rd Aug 2022 6:50 pm
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kevofcov
 


Member Since: 06 Nov 2007
Location: Other end of M69
Posts: 529

England 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Java BlackDiscovery 4

Thank you gents for your interest and very prompt replies. I have found the problem - operator error...

You need to have the engine running and your foot on the brake pedal before the handbrake will turn off.
Whistle
Not the case for appling the handbrake Embarassed
In my defence it is SWMBO’s car and a rarely drive it. I’m happy for all to have a chuckle at my expense and I will adjust the rear handbrake first thing Sunday morn. That’s a promise.
  
Post #23029505th Aug 2022 5:27 pm
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Kilovolt
 


Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1017

United Kingdom 2013 Discovery 4 3.0 SDV6 Commercial XS Auto Baltic BlueDiscovery 4

In certain quarters of the Royal Navy they call that a PICNIC Rolling Eyes

Problem In Chair, Not In Computer Laughing
 "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"

Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything Smile
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power) Smile 
 
Post #23030156th Aug 2022 9:19 am
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kevofcov
 


Member Since: 06 Nov 2007
Location: Other end of M69
Posts: 529

England 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Java BlackDiscovery 4

Handbrake adjusted and all good.

One strange thing though. When rotating the disc using my torque wrench (set at 65) the halfshaft nut started to unscrew... It’s a castle nut but nothing to retain it. It left the factory like this I assume because no work ever undertaken.
Manual says no special procedure just tighten to 350nm. I’m going to get Doris to apply the foot brake and retighten.
Any thoughts on why so loose and what should be securing it?


Click image to enlarge






  
Post #23031857th Aug 2022 5:09 pm
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Flatlander
 


Member Since: 20 Jul 2015
Location: Here
Posts: 575

United Kingdom 

It's not a castle nut, it's a taper nut, the 'castle' bits should bite into the thread as it's tightened. Very odd that it was so loose - is there any play in the wheel bearing?

ETA - looking at it again, I'm not sure that is the right nut, the fronts have a 'collar' that should be deformed (staked) into the groove in the driveshaft once torqued up, I'm sure the rears should be the same...
  
Post #23031877th Aug 2022 5:17 pm
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kevofcov
 


Member Since: 06 Nov 2007
Location: Other end of M69
Posts: 529

England 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Java BlackDiscovery 4

Back from work early today so a quick update.
I’ve compared this n/s nut to the o/s and they are identical. No play in either wheel and when I applied my torque wrench to the suspect n/s nut it took very little to reach 350nm so all good.
In conclusion I think the nut moved on the thread because this style of nut only needs 65nm to slacken from 350nm.
Thanks again all for your interest and help Thumbs Up
  
Post #23033118th Aug 2022 6:54 pm
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